| 摘要 |
PCT No. PCT/CH84/00135 Sec. 371 Date Apr. 24, 1985 Sec. 102(e) Date Apr. 24, 1985 PCT Filed Aug. 23, 1984 PCT Pub. No. WO85/01124 PCT Pub. Date Mar. 14, 1985.The displacement devices (17, 23: 17', 23') and the orientation hinges (21, 26: 21', 21') of the lens holder body and of the image holder body (11 resp. 12) cooperate with electric emitters (36, 35, 38, 29: 36', 27', 28', 29') of which the output signals are provided to an electronic circuit (45). The circuit comprises intermediary memories for said output signals, as well as at least one unit for comparing the contents of the intermediary memories associated to the measuring emitter corresponding to the lens holder body and to the image holder body. When two memorized values which have been compared are within a predetermined tolerance range the circuit provides an output signal which energizes an optical or acoustic signal device (46). The present invention enables to transmit motions and orientations of the focal plane (31) with higher accuracy than before and without the need of scales of the objective holder (27). |
